As more US households switch to VoIP-based home phone services, a common question arises: Will my landline call blocker still work?
Yes — most call blockers, including CPR Call Blocker, are compatible with VoIP home systems used by major carriers like AT&T, Spectrum, Xfinity, and Verizon. Here’s what you need to know to make sure yours works perfectly.
What Is a VoIP Home Phone System?
VoIP (Voice over Internet Protocol) systems use your internet connection to make and receive calls instead of copper telephone lines. Your phone plugs into a router, modem, or VoIP adapter instead of the wall jack.
Providers like AT&T, Spectrum, and Xfinity already deliver VoIP as standard for home phones.
Summary: VoIP routes phone calls over your internet connection instead of traditional landlines.
How Do Landline Call Blockers Fit In?
Traditional call blockers sit between your phone line and base unit. With VoIP, the same principle applies — but instead of connecting to a wall socket, you connect to your router’s TEL port or VoIP adapter.
Devices like the CPR Call Blocker V5000 or V100K support both analog and VoIP lines using a standard RJ11 connector.
Summary: Call blockers connect between your router’s TEL port and your phone base, filtering scam calls before they reach you.
Are Landline Call Blockers Compatible with VoIP Services?
Yes. CPR Call Blockers and similar devices work with most US VoIP providers, including:
- AT&T Phone (formerly U-verse Voice)
- Spectrum Voice
- Xfinity Voice
- Verizon Fios Digital Voice
- Vonage Home Phone
As long as your service supports Caller ID, your call blocker will work seamlessly.
Summary: Modern call blockers are VoIP-compatible with major US carriers that support Caller ID.
How to Install a Call Blocker on a VoIP Home System
- Locate the TEL or PHONE port on your router or VoIP adapter.
- Plug your call blocker into that port using the included RJ11 cable.
- Connect your phone base unit into the call blocker’s “Phone” port.
- Activate Caller ID with your service provider if not already enabled.
- Test with a trusted number to confirm it’s working.
Once connected, your call blocker filters all incoming calls on your VoIP line.
Summary: Connect the device between your router’s TEL port and your phone, then activate Caller ID.
Why Caller ID Is Essential
Call blockers depend on Caller ID to identify numbers. Without it, they can’t filter incoming calls accurately.
Most US VoIP providers include Caller ID for free, but verify this through your account settings or customer support.
Summary: Ensure Caller ID is active on your VoIP service for accurate blocking.
What If It Doesn’t Work Right Away?
If your call blocker isn’t blocking calls on VoIP, try:
- Checking your router port—use TEL, not Ethernet.
- Restarting both the router and device.
- Ensuring the device isn’t at memory capacity.
- Contacting your carrier to confirm Caller ID transmission via VoIP.
If you’re using a very old model, upgrading to a CPR Call Blocker V100K ensures full compatibility.
Summary: Most issues stem from port connection or Caller ID—quick fixes resolve them.
Why Physical Call Blockers Are Still Necessary with VoIP
Even though carriers like AT&T and Spectrum offer spam filtering, a physical blocker gives:
- Local control—you decide who’s blocked.
- Instant updates—manually block new numbers.
- Offline protection—works even during internet outages.
- Added security for seniors or families.
Summary: Hardware call blockers provide reliable, user-controlled protection alongside carrier tools.
Conclusion
Yes — landline call blockers are compatible with modern VoIP home systems. By connecting through your router’s TEL port and enabling Caller ID, you’ll enjoy the same powerful scam protection on your digital home phone line.
Explore our range call-blocking devices to protect your loved ones today.
FAQs
Q: Can I use my CPR Call Blocker with VoIP?
A: Yes—just connect it through your router’s TEL port.
Q: Does it need the internet to work?
A: It uses your VoIP line but doesn’t require Wi-Fi or data access.
Q: Will it block spoofed or international calls?
A: Yes—most models have settings to block both automatically.
Q: Is Caller ID required?
A: Yes, it’s essential for recognising scam numbers.
